/** @file * IPRT - Symbolic Link Manipulation. */ /* * Copyright (C) 2010-2022 Oracle Corporation * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) as published by the Free Software * Foundation, in version 2 as it comes in the "COPYING" file of the * VirtualBox OSE distribution. VirtualBox OSE is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. * * The contents of this file may alternatively be used under the terms * of the Common Development and Distribution License Version 1.0 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the * VirtualBox OSE distribution, in which case the provisions of the * CDDL are applicable instead of those of the GPL. * * You may elect to license modified versions of this file under the * terms and conditions of either the GPL or the CDDL or both. */ #ifndef IPRT_INCLUDED_symlink_h #define IPRT_INCLUDED_symlink_h #ifndef RT_WITHOUT_PRAGMA_ONCE # pragma once #endif #include #include RT_C_DECLS_BEGIN /** @defgroup grp_rt_symlink RTSymlink - Symbolic Link Manipulation * @ingroup grp_rt * * For querying and changing symlink info (mode, ownership, etc) please refer * to the @ref grp_rt_path "RTPath" API: RTPathQueryInfoEx, RTPathSetOwnerEx, * RTPathSetModeEx and RTPathSetTimesEx. * * @{ */ /** * Checks if the specified path exists and is a symlink. * * @returns true if it's a symlink, false if it isn't. * @param pszSymlink The path to the symlink. * * @sa RTDirExists, RTPathExists, RTSymlinkExists. */ RTDECL(bool) RTSymlinkExists(const char *pszSymlink); /** * Checks if this is a dangling link or not. * * If the target of @a pszSymlink is a symbolic link, this may return false if * that or any subsequent links are dangling. * * @returns true if it's dangling, false if it isn't. * @param pszSymlink The path to the symlink. */ RTDECL(bool) RTSymlinkIsDangling(const char *pszSymlink); /** * RTSymlinkCreate link type argument. */ typedef enum RTSYMLINKTYPE { /** Invalid value. */ RTSYMLINKTYPE_INVALID = 0, /** The link targets a directory. */ RTSYMLINKTYPE_DIR, /** The link targets a file (or whatever else). */ RTSYMLINKTYPE_FILE, /** It is not known what is being targeted. * @remarks The RTSymlinkCreate API may probe the target to try figure * out what is being targeted. */ RTSYMLINKTYPE_UNKNOWN, /** The end of the valid type values. */ RTSYMLINKTYPE_END, /** Blow the type up to 32-bit. */ RTSYMLINKTYPE_32BIT_HACK = 0x7fffffff } RTSYMLINKTYPE; /** @name RTSymlinkCreate flags. * @{ */ /** Don't allow symbolic links as part of the path. * @remarks this flag is currently not implemented and will be ignored. */ #define RTSYMLINKCREATE_FLAGS_NO_SYMLINKS RT_BIT(0) /** @} */ /** * Creates a symbolic link (@a pszSymlink) targeting @a pszTarget. * * @returns IPRT status code. * * @param pszSymlink The name of the symbolic link. * @param pszTarget The path to the symbolic link target. This is * relative to @a pszSymlink or an absolute path. * @param enmType The symbolic link type. For Windows compatability * it is very important to set this correctly. When * RTSYMLINKTYPE_UNKNOWN is used, the API will try * make a guess and may attempt query information * about @a pszTarget in the process. * @param fCreate Create flags, RTSYMLINKCREATE_FLAGS_*. */ RTDECL(int) RTSymlinkCreate(const char *pszSymlink, const char *pszTarget, RTSYMLINKTYPE enmType, uint32_t fCreate); /** @name RTSymlinkDelete flags. * @{ */ /** Don't allow symbolic links as part of the path. * @remarks this flag is currently not implemented and will be ignored. */ #define RTSYMLINKDELETE_FLAGS_NO_SYMLINKS RT_BIT(0) /** @} */ /** * Deletes the specified symbolic link. * * This will try to refuse deleting non-symlinks, however there are usually * races in the implementation of this check so no guarantees can be are made. * * @returns IPRT status code. * @retval VERR_NOT_SYMLINK if @a pszSymlink does not specify a symbolic link. * * @param pszSymlink The symbolic link that should be removed. * @param fDelete Delete flags, RTSYMLINKDELETE_FLAGS_*. */ RTDECL(int) RTSymlinkDelete(const char *pszSymlink, uint32_t fDelete); /** @name RTSymlinkRead flags. * @{ */ /** Don't allow symbolic links as part of the path. * @remarks this flag is currently not implemented and will be ignored. */ #define RTSYMLINKREAD_FLAGS_NO_SYMLINKS RT_BIT(0) /** @} */ /** * Read the symlink target. * * @returns IPRT status code. * @retval VERR_NOT_SYMLINK if @a pszSymlink does not specify a symbolic link. * @retval VERR_BUFFER_OVERFLOW if the link is larger than @a cbTarget. The * buffer will contain what all we managed to read, fully terminated * if @a cbTarget > 0. * * @param pszSymlink The symbolic link that should be read. * @param pszTarget The target buffer. * @param cbTarget The size of the target buffer. * @param fRead Read flags, RTSYMLINKREAD_FLAGS_*. */ RTDECL(int) RTSymlinkRead(const char *pszSymlink, char *pszTarget, size_t cbTarget, uint32_t fRead); /** * Read the symlink target into an API allocated buffer. * * This API eliminates the race involved in determining the right buffer size. * * @returns IPRT status code. * @retval VERR_NOT_SYMLINK if @a pszSymlink does not specify a symbolic link. * * @param pszSymlink The symbolic link that should be read. * @param ppszTarget Where to return the target string. Free the string * by calling RTStrFree. */ RTDECL(int) RTSymlinkReadA(const char *pszSymlink, char **ppszTarget); /** @} */ RT_C_DECLS_END #endif /* !IPRT_INCLUDED_symlink_h */